Co nanoparticles combined with nitrogen-doped graphitic carbon anchored on carbon fibers as a self-standing air electrode for flexible zinc–air batteries

2020 ◽  
Vol 8 (15) ◽  
pp. 7184-7191 ◽  
Author(s):  
Yangshen Chen ◽  
Wenhui Zhang ◽  
Zeyu Zhu ◽  
Lulu Zhang ◽  
Jiayi Yang ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Active Sites ◽  
Graphitic Carbon ◽  
Air Electrode ◽  
Nitrogen Doped ◽  
Co Nanoparticles ◽  
Zinc Air Batteries

The flexible Co@NPCFs composites can provide rich active sites for electrocatalysis and are able to capture oxygen and desorb the OH− during the discharging and charging processes of ZABs.

Nitrogen-doped carbon fibers embedding CoOx nanoframes towards wearable energy storage

Nanoscale ◽  
2020 ◽  
Vol 12 (16) ◽  
pp. 8922-8933 ◽  
Author(s):  
Cheng Yang ◽  
Yuzhu Li ◽  
Binbin Zhang ◽  
Yuebin Lian ◽  
Yong Ma ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electrochemical Properties ◽  
Carbon Fibers ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Zinc Air Batteries

Nitrogen-doped carbon fibers embedding CoOx nanoframes were fabricated by electrospinning ZIF-67, serving as freestanding electrodes for sodium-ion batteries and zinc-air batteries with great electrochemical properties and mechanical deformability.

A metal and nitrogen doped carbon composite with both oxygen reduction and evolution active sites for rechargeable zinc–air batteries

2020 ◽  
Vol 8 (31) ◽  
pp. 15752-15759 ◽  
Author(s):  
Jinjie Fang ◽  
Xuejiang Zhang ◽  
Xingdong Wang ◽  
Di Liu ◽  
Yanrong Xue ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Active Sites ◽  
Carbon Composite ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Zinc Air Batteries

A metal carbon composite Fe,Ni–N–C/N-CNT with both Fe–Nx and in situ generated NiFe2O4 nanoparticles has both good ORR and OER activities.

Highly nitrogen-doped graphitic carbon fibers from sustainable plant protein for supercapacitor

2018 ◽  
Vol 121 ◽  
pp. 226-235 ◽  
Author(s):  
Jingqi Yang ◽  
Yixiang Wang ◽  
Jingli Luo ◽  
Lingyun Chen
Keyword(s):  
Carbon Fibers ◽  
Graphitic Carbon ◽  
Plant Protein ◽  
Nitrogen Doped

scholarly journals A Porous Nano-Micro-Composite as a High-Performance Bi-Functional Air Electrode with Remarkable Stability for Rechargeable Zinc–Air Batteries

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yasir Arafat ◽  
Muhammad Rizwan Azhar ◽  
Yijun Zhong ◽  
Xiaomin Xu ◽  
Moses O. Tadé ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
High Performance ◽  
Metal Organic Framework ◽  
Extended Period ◽  
Perovskite Oxide ◽  
High Catalytic Activity ◽  
Air Electrode ◽  
Nitrogen Doped Carbon ◽  
Zinc Air Batteries

AbstractThe development of bi-functional electrocatalyst with high catalytic activity and stable performance for both oxygen evolution/reduction reactions (OER/ORR) in aqueous alkaline solution is key to realize practical application of zinc–air batteries (ZABs). In this study, we reported a new porous nano-micro-composite as a bi-functional electrocatalyst for ZABs, devised by the in situ growth of metal–organic framework (MOF) nanocrystals onto the micrometer-sized Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) perovskite oxide. Upon carbonization, MOF was converted to porous nitrogen-doped carbon nanocages and ultrafine cobalt oxides and CoN4 nanoparticles dispersing inside the carbon nanocages, which further anchored on the surface of BSCF oxide. We homogeneously dispersed BSCF perovskite particles in the surfactant; subsequently, ZIF-67 nanocrystals were grown onto the BSCF particles. In this way, leaching of metallic or organic species in MOFs and the aggregation of BSCF were effectively suppressed, thus maximizing the number of active sites for improving OER. The BSCF in turn acted as catalyst to promote the graphitization of carbon during pyrolysis, as well as to optimize the transition metal-to-carbon ratio, thus enhancing the ORR catalytic activity. A ZAB fabricated from such air electrode showed outstanding performance with a potential gap of only 0.83 V at 5 mA cm−2 for OER/ORR. Notably, no obvious performance degradation was observed for the continuous charge–discharge operation for 1800 cycles over an extended period of 300 h.

Active site-engineered bifunctional electrocatalysts of ternary spinel oxides, M0.1Ni0.9Co2O4 (M: Mn, Fe, Cu, Zn) for the air electrode of rechargeable zinc–air batteries

2017 ◽  
Vol 5 (39) ◽  
pp. 21016-21026 ◽  
Author(s):  
Yi-Ting Lu ◽  
Yu-Ju Chien ◽  
Ching-Fang Liu ◽  
Ting-Hsuan You ◽  
Chi-Chang Hu
Keyword(s):  
Active Site ◽  
Active Sites ◽  
Air Electrode ◽  
Bifunctional Electrocatalysts ◽  
Spinel Oxides ◽  
Zinc Air Batteries

The active sites of M0.1Ni0.9Co2O4 for the OER and ORR are successfully engineered for its application in rechargeable Zn–air batteries.

scholarly journals Efficient Catalytic Conversion of Polysulfides by Biomimetic Design of “Branch-Leaf” Electrode for High-Energy Sodium–Sulfur Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Wenyan Du ◽  
Kangqi Shen ◽  
Yuruo Qi ◽  
Wei Gao ◽  
Mengli Tao ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Electrochemical Reaction ◽  
Molecular Layer ◽  
Specific Capacity ◽  
High Energy ◽  
Reduction Reaction ◽  
Biomimetic Design ◽  
Co Nanoparticles ◽  
Sodium Sulfur

AbstractRechargeable room temperature sodium–sulfur (RT Na–S) batteries are seriously limited by low sulfur utilization and sluggish electrochemical reaction activity of polysulfide intermediates. Herein, a 3D “branch-leaf” biomimetic design proposed for high performance Na–S batteries, where the leaves constructed from Co nanoparticles on carbon nanofibers (CNF) are fully to expose the active sites of Co. The CNF network acts as conductive “branches” to ensure adequate electron and electrolyte supply for the Co leaves. As an effective electrocatalytic battery system, the 3D “branch-leaf” conductive network with abundant active sites and voids can effectively trap polysulfides and provide plentiful electron/ions pathways for electrochemical reaction. DFT calculation reveals that the Co nanoparticles can induce the formation of a unique Co–S–Na molecular layer on the Co surface, which can enable a fast reduction reaction of the polysulfides. Therefore, the prepared “branch-leaf” CNF-L@Co/S electrode exhibits a high initial specific capacity of 1201 mAh g−1 at 0.1 C and superior rate performance.

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